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  1. data RE a            -- regular expressions over an alphabet defined by 'a'
  2. = Empty          -- empty regular expression
  3. | Sym a          -- match the given symbol
  4. | RE a :+: RE a  -- concatenation of two regular expressions
  5. | RE a :|: RE a  -- choice between two regular expressions
  6. | Rep (RE a)     -- zero or more repetitions of a regular expression
  7. | Rep1 (RE a)    -- one or more repetitions of a regular expression
  8. deriving (Show)
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